# SDR KCSA201809211226

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: September 21, 2018
- Submitted: September 21, 2018
- Operation: Air carrier
- Aircraft: [N539BC](https://openairdocs.org/aircraft/N539BC), registered now
- Make and model: Boeing 747-4B5
- Registry model: [Boeing 747-4B5](https://openairdocs.org/model/boeing-747-4b5) (OpenAirDocs)
- Aircraft serial: 26395
- Aircraft time: 89,681 hours, 15,854 cycles
- System (JASC): [5320 · Fuselage Miscellaneous Structure](https://openairdocs.org/jasc/5320)
- Part: Torque Box
- Condition: Cracked
- Location: Fuselage
- Stage of operation: IN
- How discovered: V
- Nature of condition: O
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/KCSA201809211226

## Discrepancy

AFT PIT UPPER TORQUE BOX SKIN AT APPROX STA 1840, LBL 40 HAS POSSIBLE CRACK.

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